What you do mean it's okay

A response used towards someone who undervalues a thing bestowed upon them. They obviously do not realize the value nor the perks of the thing.

Platonic boy friend: Merry Christmas!!! What did you get?
Platonic girl friend: I got a gift from my uncle, he got me these Sennheiser headphones, HD 660 S I believe
Platonic boy friend: WTF??? Wow I am jealous lol, that's a very luxurious headset. So do you like them??
Platonic girl friend: Eh it's okay
Platonic boy friend: ..... what you do mean it's okay?!? Do you not realize how blessed you are????